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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7e26c769a83267ba939044161b71ac9f1230a917c4a03dd43af95b56695d25' 
  AND token = 'l2Sm0xG9E4PTif6t6jthnStCUeMbKtVF2YmTFcxbv6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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