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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca5e7114861f5001b806c1673d750ff5e78a80b9d5f68b9d5314e4af471a52f' 
  AND token = 'c+gmqjCE8KmWIkFgw9PngrPAJpDZXMtHPrUacrs8r4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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