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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835089bd1cd5dccb71a087216735c0bd5b88f28bc6780c8b8537e83fc2958dee' 
  AND token = 'eN6qeYC9tRYPHtuX/CiUMmyOGb3iQETh6lU8hrZvNaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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