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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e566709b6ea2d04e9841923efab94efd447d6c075182a3b36d2cad5b316f84bc' 
  AND token = '8OgI5i+knqLq9eKaOj8k7RQdcH3jmJazIAl7kP62I1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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