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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d601b9856f4e5a373919fe296ccf82ab0efebb4822f0046bcd65b3821b8b87d' 
  AND token = 'Hk99cplajJz0NerAXsrJzgY8VZC7yEtuUEo2iVT/nqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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