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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03d859beecad0dd6bd3ae3f88145860849a6d671303cb57df387a7a346f095d' 
  AND token = '6GJw8fAHba2xvq8/nsaJDVAOO+tsTGMGkv1zqQuOol4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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