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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8e3345dddd419d2a80a9695e8ad739fea34d5deb7246dfd332b776cf34a7ed' 
  AND token = 'swSxS2GU3D1FyAUc8TeHzh4ZwzJludYmZRvfveEUp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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