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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a138cdc6617f625dbd2f4b7b3443836b56306509349c41e2a971a9738972125' 
  AND token = 'PnNeJXIM6CEb06I8nUNj60jB/QgDqF8iLLx504Kjg6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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