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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c170692d7a662d4b11cf345ce8a807889112b7306a47f890d5ead1ebce86de' 
  AND token = 'S+uH937TCDp4iGoyTGRO4kdcgmesg9UJ35Juv8SoadM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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