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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86768408849887eb7f2206aa16631f038433232a647b0f359c9dd45d0452cede' 
  AND token = 'i+GmOLRvpfrOId98CrWkrHILyQAfasVBS6QRQmX34Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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