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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829d98305a2cb13e7c39d5391e29cca05c3790d81b571ca9fea820ff09c375c5' 
  AND token = '/QRMzslHHsrfv0fXgnniVdQ+roDjz1jve8NV3bv2Xy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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