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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbde0c7b19416d1f2ee2b7ff131e5490be57bc43df8e44ed1bda66b84c57142' 
  AND token = 'f47XLSZn3GUtxhDr9CAurZsuAcKJeHbP+Oa48Xmybuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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