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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ef36efb48467debb8d9a86ff381b9782808e2f8379ee39598e8d19db39b663' 
  AND token = 'd5XBrgOh4+TVIyMTIjc29fyd0dIgRGWGn5Xcdg5wP8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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