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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ef705541e637daeb4bce6f0b4b887429fd27e1417825900f42124fc0448826' 
  AND token = 'KeDaj1kgcYXwuSM81lNZWgDoc1piAqhkWxi650PVjTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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