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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dbba8598e93705b52c620ec9daddbc3d2f01f25b51f5ce2ad83f514a0c0f76' 
  AND token = '5QsSOFg7dxpbmDl5WzJBkddhBcscbxHC3LGzxCTvamc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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