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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915b3248e5c8e9f3c2c3c4994057cc5e7ab2304071b638659490d2c9a029598c' 
  AND token = 'aeZ92h2IkcYRdkjCvx4ai4SCnju9+TIix28TSO+h18o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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