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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ba97f56e7ce6dfd85f8af841469d9191e2bf03478b83381c21c64e400289d8' 
  AND token = 'ypKWT2uLJ6awhDyCbWdg/5B+kDiKeXhS4sVp2dXbkLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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