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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c3ce23cac00c595c3991f8f6920dbc87e24ac42a3fd8c1e6335a0bb0ba0dd6' 
  AND token = 'CDVBJ4LSMN+C81oXOI0/Ua/ZGfeV5h9Z3tm+AOSOHAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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