SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edcad279a2a880fbfe25056c96645588954ab67b1dab7f947bbf461483036d0' 
  AND token = 'RwqmGQNPHYCI8G4NMvWo+D2u2zx3OUOdShGsDbKoSeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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