SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb5a902e0478c9ecf4cc3a0e74243a8b0e6b7f32c8f8585d0196cc845fd8a97' 
  AND token = 'yps+AuovAZ/VZisZpDrKxE06MlmKyYIRwPJPgdYSWDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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