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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ba11a4cdd8eedd9de384d7b3a13fc2ce80ffd7122e51bc64136badc5961d0b' 
  AND token = '1mx//nNQJcQhXIHDylO/Bt7bj0DRa66FonYb8WBy4C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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