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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc4b088dbd0aa7ba02953dbf7ac6cd057d3574622387fd7a9579397175be003' 
  AND token = 'SZLjpFYa+cxB6Uuuic9Dy42o/OlAYVC191tHP6jjUto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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