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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfac123bf4fc3ece86e0455b86478da4b6fd5777c8e04481e9abcf1d1a1d656' 
  AND token = 'oKhktoOc1xOIjlwHUMMywpPM0aUTIW0rUr25cCvWTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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