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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1ad1a075da194972bd6c7c8f58217eb29be361f7715de78ccb7b138aeb0c81' 
  AND token = 'yP2YzJhTQt2tSZc3k8gKUikfgvlQjfbAdUuM3/NRmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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