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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd54ca80c7b7a24e4252ce7413c407392788eb600d1b70263a12e552a55b4afc' 
  AND token = 'rs1K1uQrAhCgfNdHQlh23Mu9FJcP6uDJueO7fQ/KiCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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