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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053cfbb308f7af5ca9d2a21edb376e7519123fc4c77851914d3a589669c6ac24' 
  AND token = 'JK14Pe/KTpSkkjObKW6Iby8vN1gsyhZqiV757pPvdxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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