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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac5e7a2a8092700df652bdbec19f2cf0799215acd9c5784bdce26d772c872f5' 
  AND token = 'lqJmn64Yn5PL1DRVtg2FEskSeCXowNOd8fMiL5ARw/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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