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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93ef64e456caf727476ba7b8c8981ef6650be4fa4a6c5f7b0eddf6de83deb66' 
  AND token = '2JpVUwzT5k+37YbzCDQE9kbdN1fBoZBmsKF0Xt+/17w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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