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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4489296567f740c93ea759d285a4264848790dfbda122e787ee340de2f63b9' 
  AND token = 'bJqGwQLCtFaJsnETMn+QuUTfgIM5p7sWV93foBE4XYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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