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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513401cb8cccc690a89ef1d7ae1aa8c714cdd6cd1f035af3dcb62a6ed8423e5' 
  AND token = 'onr2TL3eDsNEubjppbu4MNshA905P46c6Q0U8WkpCO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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