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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9127d81800c66b9b8d250de5fb66db35e2956deb7a988fe0c4abe31e153bb4e' 
  AND token = 'xxOLpKhxq7QUkUIqSsuYOa1SZFjneEjIno0lCgx7+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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