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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e53c0c723b9e31074c3ea83b190b1384281c84e9eb4fe8a039cfa72e20751bb' 
  AND token = '/5LaU7t01Jdf0hKkb71e62G4PsSH79ExZjBR4foS1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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