SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56edc0c5833184cd02b39468e4b9a8bcee64b25f8055cf6efbc63c3074715d3c' 
  AND token = 'vRz3+RQZJOKW4YZfXvFj0myxgImCAu/jC+9RDhWh78w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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