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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a992593aa0f741687b527ce993865575ed9c2ff7f70af3d706c0d8930d0ae8' 
  AND token = 'rsfFPStQn0ZL1JeFzsve2l4WsqeYL3kWLwUZ6HHouCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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