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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ee41c778f49677dd0fe122fd7b613690361608ca2cee7f6a0de3cb5173e00b' 
  AND token = 'yXLcQIwAgzs+7bE94GUem7+SBrCAdK5ybslyOKj0B+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}