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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce87f69c5fcc109041cbe17f66bcc752afc461c2babcac1908ba765e400ee481' 
  AND token = 'zJpxhgoVQ6M1hiA2P3CdraRnEJIET7V7DuzV5v5K9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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