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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5063e1533f61e7ac1c2ba5aaa112882a1eed68b665754d102b542517d0af8415' 
  AND token = 'mwW4fB4sbYuz2Q7Cn8df0iP3pk79CUVDM7SQH4fFWjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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