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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb87ffd167bdac7bba1fc64cbf9a4786204b3c29a2a990d8549418660384dabd' 
  AND token = 'yo2+Pwzj5ddP82k4ELz+iJ39X7ftxebUe6PlulWVsdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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