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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5698bdcf5fece09816c53ff9248242003991928b1ea885c26a4343a0d02cd12' 
  AND token = 'fcxHRkPcAKu5aF5X8u5AxbOwcxoGUEe3YsrcCYCV+uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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