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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a368e9564f85f85cea03e98b2196e554c7b74f0aeff4176306c8235921ad7e' 
  AND token = 'Pl6t7dJ6GTGS9J/Sa+mDB7kLiGVh3ERtLzs6tAo0gdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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