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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b756a92056efa552d28c48a2d8de82eb887ce64ff960ec779065be105144ee5' 
  AND token = 'xfOpmEAzr4XoLiS/t2xovjSDOrV1eYLjYRqzO+JON28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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