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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec74481e46b3dc8d1d13f8c4969b6cc06019fdbc3e71a5f29a03c763e5e92917' 
  AND token = 'X4c5RjzCSFXoVWYC+BXL+/xyZTaD1PRrj5qo5fXdLS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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