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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc88c209ed1c9ad6e2c816385244a43c65adbbafdd250c8cc73de9aff890513' 
  AND token = 'n7sE+/6EjpwiLGcgpKJMFLTHOvvy4KakHz/0jyU8YAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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