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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac5c710cb208205d338de079fc079566a66becd6f72f03648d4293a1a4e2d78' 
  AND token = 'a7KVg1yG2gIXxnFk5azis1XW5SB7sFjtReWDvysqox8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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