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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d25304ef15cfe6ab84dfec110142cc5cd2a60937854b478b8d2d54a91b605f' 
  AND token = 'CnNhzvU9FgnYixzH0Y/RYjh+0eoElgI4diU+gFFvpo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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