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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47732da862a01b81ed4f828e34d1ae5ac61cc0036d8902a8dd69e19beb76bc9' 
  AND token = 'j75N0NyvSgARvMb6cwbt0Kf35O6F0zuik6H4DRTAT0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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