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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388d57eaa4b657f84a22e753ff05e8584ca248a65ae3208280165a77cb861c57' 
  AND token = 'Cvv1amCE2YzIqNKF0eMK5qchXSOhCtollSOHgDKUTBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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