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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80cd66f6372f47615b1f76c0c5b20340d6284364bcda0f31aa5aeff9471f56d' 
  AND token = 'rYA7jZGd7sf4tT3VDJBOhIixIAh7Uz9+AB25j17Dn38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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