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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d7e5b0e4f49b36944e8b9d4332f9c0f47bba39a235a1fbfd2e7860c49333f' 
  AND token = 'X+9SuVLZKGRnY85VKdKUhK2vsL9tq4itdUqfqL0Izf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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