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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600a2de3d7400d11cfdbc0aae5d60a592018da2decd00b4503fbd2e20b36505d' 
  AND token = 'yNj0LhdO78moIGTqapRjKDQnbgNfRsjoKf2euMq/eHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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