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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cd74e5dd46e34d8531c9c0ad3f5dd16a27894f75e3a8076482e5cdc3e694c4' 
  AND token = 'pkxN/Ocsy9KsoNaoTyyo6zjwlLEZWWGzvpwUJFe9PqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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