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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc626178fb2d7b2dfe24a8f4cbf9b64b9f961e628fcd4ef6e32056f9c9512c4' 
  AND token = 'p9poNDnO9wfqK7vgsIgdSlpULDswufcvYyC6IrnPm08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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