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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283f2224140b90867575184e3e05a2eaf9567d207519f4d535d397311237ccf8' 
  AND token = 'V4ILacZi0Ch31WjGTg6CNh0WTGT0WdMmacimUFEn79k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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