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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b903066cf4aa308c0e0b36e900331c73179129da23f23df37ed7604c3254e02' 
  AND token = '2cH3nPZCbQims8ZAN4Kf3by/z/Wk1qgAtoS4fah1C5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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