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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5c3668a25a99b65f0b496a8de3973269296aabe90f1b08f1f69c48d5fb3e6b' 
  AND token = 'pLWJEEIeJooeerTrFOsD+pETEWQYJ6K2o+fibAuoOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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