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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddd77f796aba4a53a00d90e2d0cd4b582d3618586994609b9a34ebac60a3bf1' 
  AND token = 'rL7Apz0mJyufdAopE44fOi26GNio6wcNjMoak2v0hyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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