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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd16a046cc1168f39b48cffe851b400413d9a9e9dffc9dcc6fc7d4e74aca4c98' 
  AND token = 'M5jMYO0lymbtwER8ApDDQn4BEhwawtw2XXmFR0VLfTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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