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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e5c051982b95a2900505b80da1440369b01088792ab9562c089e9f055be280' 
  AND token = 'j73chWDp8aObgZXGJJeCeZ5Z1OYCCKFrx2M9Cxn2Tdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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