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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ca03763296a9a02117fa9db913dc3fa1e2adb28faf555daecbf5dd0a34329a' 
  AND token = 'ab0ym8vE6I1THaq1R7Ayrp6jXJNR1NxBGDwVpuOonq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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