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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c8dcbfad83a483f6fd94fc38fb0123084ef7a43753c5a01c67e4262aa46cea' 
  AND token = 'LUfGpV7H6OEzkRbnPx5wkXCBi6yo4I2RqeZY+3Ot7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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