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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a2fa241a7b5c1f90cee6027b4795759a422c800009b703f152771ea6ef9fd6' 
  AND token = 'fikUMfeJRyZdj1Pnxcqt/UslHGX2TgUr7TwhnLXew/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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