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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369150a5ab3221ded1184ba3115cf7a3bff231757729d9376bb0dc2021e3b10a' 
  AND token = 'YqKRJyNf/5MJUw97u31oLpDET+K/WLwNc3EEAxVVA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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