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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31b1af059d04c2c0bd755e6608973cea791a5cf12379914f5114158bd846f08' 
  AND token = 'vz9VvIvmTIzXY3e5cBgFG8Qin9eE0rkCOm4LlwFAe4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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