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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89029500dea98d0cafb3e62d5631cef679c936b4e06c1e48e68167d038b7556' 
  AND token = 'SjCdBHuQNDU+wh95bF39m6dnabp7Xfh3OSmAe/u6Bnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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