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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85174bcf3c22f964b3b6cf67df1e7fe83c5c3db27e3bb863a2711b264740d29' 
  AND token = '/MFSb7C7UuyTSbsD3i6Biac9jUkg1mm9TnR1+1dYZvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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