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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef56c213113ee53154f6bf23b76d0e8aaded115e19e6a3ef60293d7ae8508492' 
  AND token = 'nCkd0gFz9Ad16pkHc2z1PzfojxcUHZGccQHcKtBc7NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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