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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1570c97497a0bd44aa79ff73a08bbc27e3cb09d51252539cccc9a44f2aef589a' 
  AND token = 'ucJRqOitpCpMhsZ1KXx6r3uyn50h31/DAWUk9QuVfz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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